Classification of Cable Tray Bolt Grades
Cable tray bolts are classified by ISO 898 property classes, such as 4.6, 4.8, 5.8, 8.8, 9.8, 10.9, and 12.9, indicating their tensile and proof strengths.
Overview of Bolt Grades
Cable tray bolts are typically carbon steel or alloy steel fasteners used to secure cable trays, supports, and accessories. Their classification is based on mechanical properties, including tensile strength (maximum load before failure) and proof strength (stress at which permanent deformation begins) according to ISO 898 standards . The property class designation consists of two numbers separated by a dot:
- First number × 100 = nominal tensile strength in MPa
- Second number ÷ 10 × first number = ratio of proof strength to tensile strength For example, a bolt grade 8.8 has a nominal tensile strength of 800 MPa and a proof strength of 0.8 × 800 = 640 MPa.
Common Metric Bolt Grades for Cable Trays
| Grade | Tensile Strength (MPa) | Proof Strength (MPa) | Typical Use |
|---|---|---|---|
| 4.6 | 400 | 240 | Light-duty cable trays, indoor use |
| 4.8 | 400 | 320 | General-purpose installations |
| 5.8 | 500 | 400 | Medium-duty trays, moderate loads |
| 8.8 | 800 | 640 | Heavy-duty trays, structural supports |
| 9.8 | 900 | 720 | High-strength applications |
| 10.9 | 1000 | 900 | Critical structural connections |
| 12.9 | 1200 | 1080 | Extreme load-bearing or industrial environments |
Considerations for Cable Tray Installations
- Material Compatibility: Bolts should match the tray material (e.g., stainless steel bolts for stainless steel trays) to prevent galvanic corrosion .
- Environmental Resistance: For outdoor or corrosive environments, use hot-dip galvanized, stainless steel, or coated bolts to ensure longevity .
- Standards Compliance: Ensure bolts comply with ISO 898, ASTM, or NEMA VE standards for mechanical and corrosion performance .
- Load Requirements: Select bolt grades based on tray weight, cable load, and span between supports. Heavy-duty trays with multiple cables typically require 8.8 or higher grade bolts.
Summary
Cable tray bolts are classified by ISO 898 property classes, with grades ranging from 4.6 (light-duty) to 12.9 (extreme load-bearing). Selection depends on mechanical load, environmental conditions, and material compatibility, ensuring safe and durable cable tray installations .
Factory Bolt and Nut Grades Explained: Head Markings, Strength Charts
Learn the essentials of bolt and nut grades, including SAE, ISO, and ASTM standards. Discover the differences
Factory 26 05 36 Cable Trays for Electrical Systems
If cable trays are sized for future cables, specify provisions for penetrations with sleeves through fire-rated partitions or use
Factory Wire Mesh Tray Technical Guide
Product Data: Submit manufacturer''s product data sheets for cable tray indicating dimensions, materials, and finishes, including UL
Factory B-Line series Cable Tray Design Considerations
Our wind certification report provides you with list of acceptable B-Line series cable tray supports, fittings and covers based off of the
Factory GUIDE CABLE TRAYS TECHNICAL
NEMA VE 1-2017 Specifies requirements for metal cable trays and associated fittings designed for use in accordance with the rules
Factory The Ultimate Guide to Tray Cables: Types, Applications and
When it comes to powering, automating and protecting facilitiesꟷfrom factories and petrochemical plants to data
Factory Roofing Bolts & Square Nuts Cable Tray Bolts, Roofing Bolts Zinc
Grade 8.8 High Tensile Carbon Steel Commonly used with drop in anchors for suspending cable trays from ceilings or can be cut to
Factory 222 MANUFACTURING LTD
Aluminum Aluminum cable trays are fabricated from structural grade “copper free” (marine grade) aluminum extrusions. Aluminum''s
Factory QCS 2010: Cable Tray Specifications | PDF | Cable | Screw
Cable trays and accessories shall be electrically and mechanically continuous throughout their length. The entire cable tray system
Factory cable tray technical specifications cable tray
to cables when correctly inserted. Screwed connections are generally isometric threads fully compliant with ests in accordance of the
Factory Document DICOS
Tray-rated cables are required for cable tray installation, so using a channel cable tray system or wire mesh system for exits may be
Factory B-Line series Cable Tray Design Considerations
As an industry leader in cable tray, Eaton offers one of the widest ranges of cable management solutions available in the market
Factory Codes and Standards | Cable Tray Institute
The Cable Tray Institute is making available the current edition of this practical guide for the proper installation of aluminum or steel
Factory Types of Cable Trays – Advantages, Applications and Sizes
Explore the types of cable trays, their advantages, applications, and standard sizes. Learn how they improve cable
Factory Cable Tray Standards | Cable Management | Metsec
Metsec cable tray systems are usually assembled using M6 roofing bolts particularly for couplers, fishplates and connection to
Factory Full cable tray systems specification document
A. General: Except as otherwise indicated, provide metal cable trays, of types, classes and sizes indicated; with splice plates, bolts,
Factory Cable Tray Bolts and Nuts
Discover cable tray bolts and nuts with CE-certified, corrosion-resistant steel for secure, industrial-grade cable
Factory A T&B Cable Tray Metallic cable tray
Cable tray systems, including trays, supports, fittings and other materials, are generally much less expensive than conduit wiring
Factory THOMAS & BETTS CABLE TRAY SYSTEMS
The Benefits of Cable Tray Cable tray wiring systems offer significant advantages over conduit pipe and other wiring systems. Cable
Factory Grades of Bolts
These charts helps to identify the grades of bolts using the identification marks on the bolt''s head along with the strength and
Factory Electrical Cable Tray Classification
Cable Tray is a mechanical support system used for electrical cable management.Cable trays are of various types
Factory IEC 61537:2023
This document specifies requirements and tests for cable tray systems and cable ladder systems intended for the support and
Factory Technical information
Technical information Thermal contraction and expansion It is important that thermal contraction and expansion be considered when
Factory Cable Tray Technical Guide A practical guide to product selection and
Cable Tray Technical Guide A practical guide to product selection and installation This guide for engineers and installers has been
Factory Cable tray manual
Nearly every aspect of cable tray design and installation has been explored for the use of the reader. If a topic has not been covered
Factory Microsoft Word
Cable Tray Type Selection With all the choices in cable trays styles, ladder, ventilated, solid bottom and wire basket, it can be difficult
Factory LEGRAND CABLE TRAYS TECHNICAL GUIDE
Not all cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management,
Factory Non-Metallic Cable Tray Load Guidelines | PDF | Snow | Cable
This document provides information on selecting cable tray classes and load capacities. It includes tables that define the standard
Factory Cable Tray Technical Guide A practical guide to product selection and
In designing supports for a cable tray system, consideration should be given to the loads associated with future cable additions and
Factory Flextray wire basket section of NEMA cable tray
The FlextrayTM system is a flexible, field-adaptable way to manage cables throughout your project. The tray can be cut and bent to